Manhole extension



June 20, E, H WH|TE MANHOLE EXTENSION Filed May 14, 1965 YII'IIIIIIIII A5 INVENTOR.

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United States Patent O 3,326,100 MANHOLE EXTENSION Edwin H. White, 2554 Madison Ave.,

. Baltimore, Md. 21217 Filed May 14, 1965, Ser. No. 455,782 2 Claims. (Cl. 94-34) road or sidewalk, as the case may be. When streets or roads, are to be rre-surfaced, it is the practice at the present time to dig around the upper manhole housing and raise it to a position so that its upper edge will be in a plane with the upper surface of the street or road when the `street or road is re-surfaced.

The primary object of the present invention is to provide an upper attachable end for the manhole housing to increase its height to a point where it will be even with the street level after the street or road has been re-surfaced. This attachable end member is to take the place of raising the permanent manhole housing.

Another object of the invention is to provide an extension that will receive the same size cover that is used on the original manhole housing.

A further object of the invention is to provide a novel means for holding the extension in contact with the upper end of the manhole housing.

While several objects of the invention have been set forth, other objects may be apparent including its uses and advantages as the nature of the invention is more fully disclosed, which consists in its novel construction and the arrangement of its several parts as shown in the accompanying drawings and detailed description.

In the drawings:

FIGURE 1 is a vertical sectional view through the top of a manhole showing the upper manhole housing and one form of the improved extension.

FIGURE 2 is a plan view of the same.

FIGURE 3 is an enlarged fragmentary sectional view taken along line 3-3 of FIG'URE 2.

FIGURE 4 is a fragmentary sectional view of a modified form of the invention showing the extension in two parts, that is, an extension element and a holding means for said extension element.

FIGURE 5 is an enlarged fragmentary plan view of the modified form referred to in FIGURE 4.

FIGURE 6 is an enlarged fragmentary sectional view similar to FIGURE 4 showing more in detail the structure of the modied form referred to in FIGURE 4.

In referring to the drawings, like numerals are used to illustrate like and similar parts throughout the several views.

The manhole normally has a cast iron housing 8 adjacent its top in which the top edge is provided with an olf-set 8 to provide a seat 9 for a cover (not shown). The upper edge of this off-set portion is normally in a plane with the upper surface 14' of the street or road 14 as the case may be.

One form of the extension element is shown in FIG- URES l, 2 and 3. In this form, the extension is designated generally by the numeral 10. The extension may be made in any required shape or size to lit the top of the manhole housing 8, that is, round, square, or any other shape. The diameter of the outer portion 10' of the extension member is the same as the diameter of the outer edge 3,326,100 Patented June 20, 1967 8jof the manhole housing 8. Extending outwardly and integral about the outside of the extension from a line adjacent its center is a horizontal flange 13. This llange may be in the form of a plurality of extended arms as shown in FIGURE 2 or it may be in the form of a circle or any other desirable configuration. The ilange is provided with a plurality of openings 12 for aiding in holding the extension downwardly in position on the manhole. The lower portion of the extension 10 is provided with an inwardly turned olf-set portion 20 which is adapted to t into the seat 9 in place of the cover. This flange 13 is the hold-down member for the extension.

When a road or street is to be resurfaced, instead of raising the housing 8 to the new level of the new surface, the cover is removed and an extension of proper size and height is placed over the manhole, as shown in FIGURE 1, the height of the extension being the same as the thickness of the resurfacing, shown in dotted lines at 15. After the extension is in place, ythe cover (not shown)- is inserted in the top of the extension and rests upon the shoulder 10", and will, of course, be in a plane parallel'with the topl of the new surface.

The present resurfacing compositions have in their makeup a Isemi-fluid plastic material, such as pitch, which when heated enters and flows through the openings 12 and also around the edges of the flange 13 which adheres to the old road surface. When the plastic material has hardened the extension will be firmly held downwardly in place by the composition molded about the ange.

These extensions, and particularly the flange portions, are preferably constructed of a malleable iron, steel, or some material that is not easily broken by vibration or slight bending from the weight of the various vehicles passing over the road-bed.

A modified form of the invention is shown in FIG- URES 4, 5 and 6. In this form the extension 18 is quite similar to the previously described form of extension 10 with the exception that the hold-down 4flange 22 is separate from the extension itself. In having the flange separate, it gives a greater leeway for constructing the flange from a more resilient or pliable material. In the present illustration the ilange is designated as being constructed of a plastic treated fiber glass, or other suitable material; however, any suitable type of pliable material may be used such as rubber or any of the synthetic plastics. This flange 22 likewise is provided with openings 24 through which the resurfacing material may pass to better anchor the flange to the road-bed. The extension 18 is provided with an outwardly turned portion 30 to receive the hold-down flange 22. The pliable hold-down flange 22 is provided with a collar 26 which is adapted to receive the inner edge 28 of the ilange as shown in FIGURE 6. The collar 26 is made of steel or some hard substance to take the wear of the hard surface 30 of the extension.

Instead of depending upon the portion 22 or the member 24 for holding the extension ring in place, there is provided a plurality of bolts or studs 17 as shown in FIGURE 4 in which their heads are located within recesses 21, which allows the outer end of the bolt or stud to not extend inwardly beyond the inner surface 18 of the extension ring. The extension may also be welded to the upper end of the housing as shown at 19 in FIGURE 6. Both the bolts and/or studs and the welding, provide additional strength in holding the retainer in place and in some installations may be all that would be required.

These manhole extensions are all on substantially the same principle. The off-set inner portion 18" is well illustrated in FIGURES 4 and 6 and the shoulder 30 are so fitted to the upper end of the manhole housing as to take a proportionate amount of the weight which the extension may receive.

When it becomes necessary to resurface a highway in many instances a top coat is placed over the old roadbed, as shown at 14. Before this is done one of the things that is necessary is to raise the manhole upper casings, if there be any, to a point where they will be ush with the topof the top coating. With the improved extension this additional height may be obtained without the necessity of raising the original housing. An extension of the proper height and shape is selected and placed over the manhole after removing the manhole cover, and the cover is placed in the top of the extension after which the resurfacing material is placed around the eX- tension and the extension ange in the general operation of resurfacing the road-bed.

While only two specific forms of the extension have been illustrated and described, it is not intended as a limitation, as those skilled in the art are aware of the various forms for carrying out the principles stated herein. Therefore, the scope ofthe invention is best dened in the appended claims.

I claim:

1. A manhole housing extension'comprising av ring member having a lower portion adaptedito seat 25 within a manhole housing,

an upper portion of greater diameter than the lower portion, and forming with the lower portion a seat adapted to receive a manhole cover, an outwardly directed flange surrounding the ring member at junction between the lower and upper portions and forming a seat member, a resilient hold down member having an inner reinforcing ring seated upon said seat member, said hold down member having a portion extending outwardly from said reinforcing ring and provided with apertures to receive a bonding material for anchoring the yring member to a pavement 2. The structure defined in claim 1 in which said reinforcing member is of plastic material;

References Cited UNITED STATES PATENTS 3,217,619 11/1965 Driver et al. 94-34 FOREIGN PATENTS 795,956 3/ 1936 France. 261,884 1'2/ 1926 Great Britain. 452,962 9/ 1936 Great Britain.

JACOB L. NACKENOFF, Primary Examiner. 

1. A MANHOLE HOUSING EXTENSION COMPRISING A RING MEMBER HAVING A LOWER PORTION ADAPTED TO SEAT WITHIN A MANHOLE HOUSING, AN UPPER PORTION OF GREATER DIAMETER THAN THE LOWER PORTION, AND FORMING WITH THE LOWER PORTION A SEAT ADAPTED TO RECEIVE A MANHOLE COVER, AN OUTWARDLY DIRECTED FLANGE SURROUNDING THE RING MEMBER AT JUNCTION BETWEEN THE LOWER AND UPPER PORTIONS AND FORMING A SEAT MEMBER, A RESILIENT HOLD DOWN MEMBER HAVING AN INNER REINFORCING RING SEATED UPON SAID SEAT MEMBER, SAID HOLD DOWN MEMBER HAVING A PORTION EXTENDING OUTWARDLY FROM SAID REINFORCING RING AND PROVIDED WITH APERTURES TO RECEIVE A BONDING MATERIAL FOR ANCHORING THE RING MEMBER TO PAVEMENT. 